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: http://8gym-perist.att.sch.gr/Programes/water/water4.htmhttp://micro-kosmos.uoa.gr/gr/magazine/ergasies_foititon/ettap/Water/files/O_Kiklos_tu%20_nerou.htmhttp://www.deyav.gr/peribalon/60-kiklosnerouhttp://www.edutv.gr/protobathmia/o-kyklos-tou-neroyhttps://el.wikipedia.org/wiki/%CE%9A%CF%8D%CE%BA%CE%BB%CE%BF%CF%82_%CF%84%CE%BF%CF%85_%CE%BD%CE%B5%CF%81%CE%BF%CF%8Dhttp://8gym-perist.att.sch.gr/Programes/water/water4.htmhttp://kpe-kastor.kas.sch.gr/the_lake/water.htm/water_cycle.htm